Patrick J. O'Connor (born 1955) has been an alderman in Chicago's City Council representing the 40th Ward on the North Side since elected in 1983 at age 28. O'Connor was an unsuccessful candidate in the Democratic Party primary election for the Illinois's 5th congressional district special election, 2009.

O'Connor is the son of a Deputy Commissioner of the Department of Streets and Sanitation, Bureau of Equipment Services, under Chicago Mayor Richard J. Daley.

O'Connor graduated from Loyola University of Chicago School of Law in 1979. Fresh from law school, O'Connor successfully sued the city for back pay for his father after maverick Mayor Jane Byrne fired him.